– Xochielt Sanchez
Answer by Robert Frost:
No. While the EMU suit is watertight, and we do use it in a 40 ft (12 m) deep pool to train the astronauts, it is designed to hold pressure in, not to keep it out.
At the ocean floor, a diver is under great pressure from the crushing weight of the water above. A metal box can be crushed. The structure of the suit would not protect the person wearing it.